[Bug 28960] New: Screen tearing (some tiles rendered with offset) especially when scrolling etc. in DualHead mode on HD4350

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=28960

           Summary: Screen tearing (some tiles rendered with offset)
                    especially when scrolling etc. in DualHead mode on
                    HD4350
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: grzegorz.wierzowiecki at pjwstk.edu.pl
         QAContact: xorg-team at lists.x.org


I've met many problems with scrolling and window moving, but not only.
In some apps, like OO-calc I meet wrongly rendered table... like part of screen
copied and pasted with some offset in x and y axes. (Moving cursor refreshes
those fragments, minimising and maximising window also might help... but
enforcing refreshment is - at least - not comfortable).

In my case - ATI HD4350 PCI-E - problem appears when using DualHead mode,
with turned off KDE Composition (OpenGL) in order to use basic rendering
techniques (when using Composition, OpenGL etc. KDE crashes and X-Server
restarts... but when playing OpenGL games like TuxRacer everything is ok).

My setup is to 1900x1200 monitors in Dual Head, one is in pivot.
When using single head setup it is ok.

What I've found, is that 
Putting option:

Option      "AccelDFS" "off"

into xorg.conf, helped (even I have PCI-E card), not rendering is correct, but
performance decreased dramatically.

My software version is

$ LC_ALL=en pacman -Qi xorg-server | grep Version
Version        : 1.8.1.902-1

$ LC_ALL=en pacman -Qi xf86-video-ati | grep Version
Version        : 6.13.0-1

How could I help you to fix this?
(btw. Is it right place to file such bug, or is there better?)

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